SOURCE

function Person(name,age,job){      
            this.name = name;
            this.age = age;
            this.job = job;
            this.sayName = function(){
                  console.log(this.name);
            };   
}
var person1 = new Person("wsc",25,"software Engineer");
var person2 = new Person("yl",26,"Doctor");
person1.sayName()